skullpatrol
  • skullpatrol
Does 0.999...=1?
Mathematics
jamiebookeater
  • jamiebookeater
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zzr0ck3r
  • zzr0ck3r
.9999........ is not a number
zzr0ck3r
  • zzr0ck3r
have you taken calculus?
zzr0ck3r
  • zzr0ck3r
http://www.math.com/school/subject2/lessons/S2U2L1DP.html

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zzr0ck3r
  • zzr0ck3r
scroll down to number 4, its actaully an easy proof.
zzr0ck3r
  • zzr0ck3r
you will enjoy calculus:)
carson889
  • carson889
Here is an algebraic proof of it: 10x = 9.999999... with x = 0.99999... 10x - x = 9.99999... - 0.999999... 9x = 9 Thus, x = 1
zzr0ck3r
  • zzr0ck3r
This question was asked because I was trying to exaplin that inbetween any two numbers is another number, he then said what about .9999999.... and 1, i then tried to explain to him that .99999999.. was not a finite number, then we had this question posted:)
zzr0ck3r
  • zzr0ck3r
there is no amount of 9's that you can write after .9 that will make it equal to 1, but the limit as the amount of 9's goes to infinity is said to equal 1
anonymous
  • anonymous
wait... doesn't 0.9999... = 9/10 + 9/100 + 9/1000 + .... an infinite bounded series?
mayankdevnani
  • mayankdevnani
The number "0.9999..." can be "expanded" as: 0.9999... = 0.9 + 0.09 + 0.009 + 0.0009 + ...
mayankdevnani
  • mayankdevnani
1 Attachment
mayankdevnani
  • mayankdevnani
1 Attachment
zzr0ck3r
  • zzr0ck3r
lol, read this. then you will see the point of the question http://openstudy.com/study#/updates/50ab1ceee4b06b5e49334d38
mayankdevnani
  • mayankdevnani
So the formula proves that 0.9999... = 1.
mayankdevnani
  • mayankdevnani
zzr0ck3r
  • zzr0ck3r
but .99999...is not a number is the point of this topic
mayankdevnani
  • mayankdevnani
0.999999..... is a no. we have tp prove that it is equal to 1
mayankdevnani
  • mayankdevnani
*to
zzr0ck3r
  • zzr0ck3r
its a number if you think about convergence, but you can never write 1 in the form .999999999999, read the last question and you will see the point im trying to make
zzr0ck3r
  • zzr0ck3r
its not a finite number.... it can be looked at as a sequence....at infinity then its a number. I told him that between any two numbers is another number, he then said what about .99999999999..... and 1, this is what followed.
zzr0ck3r
  • zzr0ck3r
Its an extended real number in the since that infinity is an extended real number....
mayankdevnani
  • mayankdevnani
"But", some say, "there will always be a difference between 0.9999... and 1." Well, sort of. Yes, at any given stop, at any given stage of the expansion, for any given finite number of 9s, there will be a difference between 0.999...9 and 1. That is, if you do the subtraction, 1 – 0.999...9 will not equal zero. But the point of the "dot, dot, dot" is that there is no end; 0.9999... is inifinte. There is no "last" digit. So the "there's always a difference" argument betrays a lack of understanding of the infinite. (That's not a "criticism", per se; infinity is a messy topic.)
zzr0ck3r
  • zzr0ck3r
right and i dont think he has had calculus...
zzr0ck3r
  • zzr0ck3r
this started with density of rational/irational and archimedes principle on the real line
zzr0ck3r
  • zzr0ck3r
the point is, that there is an infinite amount of numbers between any two numbers a,b where a != b
mayankdevnani
  • mayankdevnani
hahhaha.. we are just fighting you and me are absolutely right...it's a skull problem..right??
mayankdevnani
  • mayankdevnani
right?? @zzr0ck3r
zzr0ck3r
  • zzr0ck3r
This one might make him want to quit math The infinite amount of numbers between 0,1 is larger than the infinite amount of numbers between 0 and infinity.:)
zzr0ck3r
  • zzr0ck3r
right:)
mayankdevnani
  • mayankdevnani
:)
anonymous
  • anonymous
0.9999 is approximately equal to 1 but it is not exactly equal.. \[0.999 \approx 1 \qquad \qquad (0.999 \ne 1)\]
mayankdevnani
  • mayankdevnani
mayankdevnani
  • mayankdevnani
this question...lol
mayankdevnani
  • mayankdevnani
http://www.math.hmc.edu/funfacts/ffiles/10012.5.shtml
Zarkon
  • Zarkon
can you provide a proof of this ... "This one might make him want to quit math The infinite amount of numbers between 0,1 is larger than the infinite amount of numbers between 0 and infinity.:)"
zzr0ck3r
  • zzr0ck3r
no, my analysis teacher said it two days ago. she said the elemnts between 0 and 1 have more mappings than 0-infinity
Zarkon
  • Zarkon
your teacher is either wrong or you have misquoted her
Zarkon
  • Zarkon
the real numbers between 0 and 1 is the same size as the real numbers from 0 to infinity
ParthKohli
  • ParthKohli
\[1 - 0.999\cdots = 0.000\cdots = 0\]

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